Tool-holder.



No. 893,942. PATENTED JULY 21, 1908. E. B. SBLLEW.

TOOL HOLDER,

APPLIOATION FILED FEB.20,1907.

2 MEETS-SHEET 1.

17, ll Z6 13 2g, .25 29 Q0 IN KLEIN I PATENTED JULY 21, 1908. E. B.SELLEW.

TOOL HOLDER.

APPLICATION FILED FEB.20,1907.

' 2 SHEETS-SHEET 2.

UNIT-En ernrn s PATENT onnron.

ERNEST B. snLLEW, or PAWTUOKET, nnozon ISLAND.

'roonHoLnnit.

Specification of Letters Patent.

Application filed February 20, 1901. semi n6. 358,510.

meme-loyal, 1908.-

v To all whom it may concern. l

Be it known that I, Ennnsr B. Snunw, a,

citizen of the United States, residing at Pa.w-"

tu'cket in the county of Providence and State of Rhode Island, haveinvented a new and useful Improvement in Tool --Holders, of which thefollowin is a specification This invention as reference to an inn- Iprovement in 'rnetal workingjnpplinnc es and more particularly to onimprovemmttoolholders for turret lathes jfor siroilernietel workingins-chines. I

- Tool holders for lathes'wie ,structod to hold the tool asiri g idlyjes nossible long. '.Under the Worlning;

in all directions and wereeecuredto the turret of the lathe in theusnelay; turn ing cylinders or sinular work hank of the tool holder isrequired to doe anger h y i or rmning'the fin.

.P P T e screening the col holder for turret edger-of" the s? automstioa lv moved away frornthdsuifheQof the work itfter the toolcompleted'its out, or on the heckwe niqvement'ofthe tool adistance-Which mi more than compensate for the return movement of thetool holder clue to the shrink of the holder twisting back or resumingits Y normal 'condition.

i My invention consists in the peculiar and 1 novelc'onstru'ctien of aneutomstio tool 'holcltr ,h'iivin detailsof construction, tie will.

holder. for 'nletal working machines said tool l' be; more in lyl setforth hereinaft r end. claimed. I

Figure 1 is a. side view of my improved ci itonnitic tool holder;showing the ber formedjntor'reli th shankt'inernloela;5

-herertofore concond r .erd movement of justabfe head .entio'n is toimprove 1 es, whereb the out ri 2 is an end viewo'f't'ne i001 holder,Show mg the holder in thep'osition it would anto tactically assume withthe tool in the cutting ?osition, a tool in broken lines secured in theolder and a. portion of the peripheral surface of a cylinder ndicatedbroken lines to'illuse trate the operation of the holder. Fig. 3 is evertical longitudinal sectional view taken online 3 3 of Fig. 2 throughthe holder, showing the tool holding member'pivotally secured to thehood member.

Fig. 4 is n horizontal'sectioncil view throughthe holder taken on line 44 of. Fig. 2, showingthe meens'ifor holding the tool in. its cuttingposition and the meens for automatically' moving the tool out of itscutting position after the cutting strain has. Fig. 5-is a side" beenremoved from the tool. view of a fornrof automatic tool'holder in whichthe head member with the tool holding member is adjustshly securedto'the shank.

Fig. 6 is on end view oflFig; 5, showing the tool holder inits normalposition or in the position it would assume to eutornaticell move thetool ewe from the Work. Fig. .7 1s e vertical sectiona view taken online 7 7 of Pi 5, through the holder, showing the tool ho dine memherpivotally secured to the admember, and Fig; 8 is e hori zontel sectionalview tekenonline 8 8 of Fi 6, showing the means for'holding the tool Inits cutting position andtlfwmeane for automsticolly. moving the tdol outof its cutting postion; after the tool has completed its out. ,,In thedrawings, d-..indioetes the shank member which is in the form of e roundbar,

b the head member, 0 the tool holding member, d the stop member, e thescrew, and f the coiled spring of my improved automatic tool holder.

The head member; b'is constructed to hove anupWerdly-extending end- 9 inwhich is a, round hole 10, e-sn oll-efofi-center. hole ll un-- der thesemewhich extends through thehead into the sheiiklag fles SllOWIL'iHFig. ,4, 'endes shown Eigs..'1,' 2", and 4 is formed integra'l withtheshe nk. -The head; member I), as shown in Figs 5; 6, Tend '8, has theoft"- center- -semi-circuler portion. 12- through which around hole 13'for the shank a and "of set bolt lfi'for securing the head to the shenl:In this form; a plurality of head members with the tool holding membersmay i required to the indicated 1n broken be secured in any positionshank a.

The tool holding member is shaped to. conform to the head I) and has averticalv slot in the face of the member for a cutting tool, the toolclamping screws 16 16, a recessed portion 17 forming 18 in which therear end of the tool is adjustably secured, a cavity 19 extending inwardfrom the inner face of the member, the walls of the cavity acting asstops on the stop member d to limit the movement of the tool holdingmember 111 either dlrcction, a transverse hole 20 extending inward fromthe side of the member, a screw-tl1readed stud '21 extending through thehole It) in the head I) and a nut 22 on the stud, whereby the tool hold-1 ing member 0 is pivotally secured to the head member I), as shown inFigs. 1, 2, 3 and, 4. As shown in Figs. 5, t), T and 8 mg member a hasthe semi-circular portion 23 shaped to conform to tho semi-circularportion 1'3 of the head I) and having the round hole 24 for the shank a.p 24 is sullieiently large to allow tor the required movement of thetool holding memher a and the wall forming the hole acts as stops on theshank a" (which now lorms a sto member d) to limit the movement oi thetoo holding member in either direction.

The stop member d, as shown in Figs. 1, 2, 3 and 4 is in the form of astud having the stem 25 for the hole 11 in the head, the enlarged end 26adapted to enter the cavity 15 in the tool holding member c and havingthe screw-threaded transverse hole 27 for the screw e.

The coiled springfis placed on the screw c and the screw inserted intothe transverse hole 20, then through a smaller hole forming a shouldertor the spring and is screwed into the screw-threaded hole .27 in thestud (I, thus bringing the spring intermediate the shoulder and the headol" the screw, as shown in Figs. '1, 2, 3 and 4.

its normal position with the cutting edge of the tool away from the.work. As shown in Figs. 5, 6, 7 and 8, a. screw-threaded trans; versehole 20 is formed in the semi-circular portion 23 of the tool holdingmember c a coiled spring inserted in the hole against the shank a and ascrew'e" screwed into the hole 20 against the sprin the tension of thespring acting to hold t e tool away from the work.

In the operation of my im roved automatic tool holder a cutting too g issecured in the tool holding member 0, as shown in broken lines in Fig.2, and the shank q, of the holder secured in the turret of the lathe inFig. 2. brought into engagemen with the work, the

the bifurcated lug j This hole 1 The tension of the spring f acts tohold the tool holding member 0 in the usual way. The work, which may bea cylinder, the peripheral surface h of which is lines, turns in thedirection of the arrow, as shown in broken lines in When the cuttingedge oi the tool is strain otthe work on the tool forces the tool andthe tool holding member t into tion, as shown in Mg. 2, against thetension of the spring f and the wall of the cavity 19 against the stopmember d, as shown in Fig. 4. The tool is now rigidly held in-a positionto give the required depth of cut. At the end of the cut on, the returnmovement of the too], the strain 01'' the work on the tool is removed.The tool holding member 0 resumes its normal position through thetension of the springf and the cutting edge of the tool is automaticallymoved out of engagement with the work. the tool holdllaving thusdescribed my invention, I claim as new and desire to secure by LettersPatent-- in an automatic tool holder, the combination of a. shankmember, a head member secured thereto, av tool holding member pivotallysecured to the head member, a stop member carried bvthe head member andadapted to engage with stop shoulders provided in said tool holdingmember, a screw extending through a' shouldered hole provided thereforin the tool holding member and screwed into said stop member, and a coilspring on the screw between the shoulder and the head of said screw.

2. in combination with a shank member, a head member secured at rightangles to said shank member, a tool holding member ivoted to the outerface of said head member at a point beyond said shank member, a stopcarried by the head member and projecting in an opening providedtherefor in the tool holding member, a spring, and means sustained fromsaid stop and carrying said spring, said spring engaging the toolholding member.

3. lircoinbination with. a shank member, a head member secured thereto,at one end and extending at right'angles therefrom, a

tool holding member noted to the outer face of said head mem )er, a stoprojecting outwardly from said outer face of the head member andextending in a shouldered opening provided therefor in said tool holdingmember, a headed screw fastened to said stop and having a portionthereof )rojecting in a shouldered opening provided t erefor in saidtool holding member, and a coil spring surrounding said screw andabutting the head thereof and the shoulder of said last named opening.

4. In an automatictool holder, a shank, a

the posimember at a point remote from said shank head member thereonformed with an up-, holding member, and means on the front face 10wardly extending end having an ogerating of the tool holding member tosupport a tool. face at right angles to the axis of sai shank, Intestimony whereof I have signed my a spring pressed tool holding memberpivoted name to this specification in the presence of to said upwardlyextending end of said head two subscribing witnesses.

v ERNEST B. SELLEW; and havin a sliding movement against said Witnesses:

operating ace at right angles to the axis of J. A. MILLER,

said shank, and a stop to engage said teol ADA E, HAGERTY,

